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Inventor

Masumi Fukuma

Inventor
Yokohama, JP

Overview

10→
Patents
1989–2020
Patent span
Physics
Primary field (CPC G)

Patents· 10 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G02Bprimary
G02BOptical elements, systems or apparatus69%
C03BManufacture, shaping, or supplementary processes8%
G01RMeasuring electric variables8%
H01BCables8%
H04BTransmission8%
PatentTitleYear
10,677,835Evaluation method for insulation performance of insulator20205,329,600'Reflection monitor optical fiber coupler manufacturing system and method'19945,205,851'Method and apparatus for producing optical fiber coupler'19935,167,685'Method for manufacturing a fiber type coupler'19925,129,020'Wavelength selective optical fiber coupler'19925,098,459'Method of manufacturing optical branching and coupling device'19925,077,814'Optical transmission line for use in an optical communication system'19915,046,804'Method for manufacturing a fiber type coupler'19915,013,117'Method for manufacturing a fiber type coupler'19914,802,732'Optical fiber cable preventing water from spreading toward cable interior'1989

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989–2020Patents assigned to SUMITOMO ELECTRIC INDUSTRIES (10)· patent assignee history
1989–1994Based in Kanagawa, JP· patent location history
1991–1993Based in Yokohama, JP· patent location history
1993–1994Patents assigned to SUMIDEN OPCOM LTD (2)· patent assignee history
2020Based in Matsue, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
SUMITOMO ELECTRIC INDUSTRIES101989–2020
SUMIDEN OPCOM LTD21993–1994
Locations
LocationPatentsSpan
Yokohama, JP51991–1993
Kanagawa, JP41989–1994
Matsue, JP12020